There were the sounds of heeled feet clicking on the floor of the school hall. This part of the school had been purposely cut off, no students allowed here because of something two girls from Class-78 had apparently reported. Both girls were warned about lying over something so serious… And honestly disgusting, but they continued to repeat their claim.

A girl had chains herself in the toilet completely nude and was now asking others to pee on her. Like some sort of toilet.

Chisa Yukizome was the owner of those heels, this was HER student. A person she had to look out for and care for, the idea of her being this messed up in the head and Yukizome just missing it made her feel… Awful. Truly.

She walked through the doors of the bathroom and the odour was awful, looking around the corner she saw why. The toilet were broken and had now begun to leak pee all over the floor, so much so that the puddles were steaming. Though that's not all. A girl was… U-Using…

Miss Yukizome could only cover her mouth in pure shock as Mukuro Ikusaba, a soldier girl from the very same class as Aoi and Kyoko who had informed her of this issue, was stood using Mikan Tsumiki as a toilet. One of HER students being peed on like she was a simple object, it made Chisa gag.

Mikan Tsumiki had her mouth wide open, letting out humming, desperately sounds as she tried to catch every bit in her throat, occasionally letting out a gulp as her mouth was filled with the disgusting yellow liquid.

"I'll be with- Mghh *gulp* you in a moment… M-Miss Yukizome!" Mikan sounded cheerful. No… Happy. She had never sounded happier, the entire time in class as she would do was whimper and stutter. This broke Chisa's heart even more, realising her student loved this life. More than the life she tried to provide in her classroom.

Standing there, Mukuro looked over her shoulder nonchalantly, locking eyes with Chisa, her dick still spurting out pee. It seemed she had noticed the look of shock on her face and without a single word. She had shoved her entire cock into Mikan's throat.

Chisa's mouth dropped open in awe as Mukuro began to thrust back and forth, fucking Mikan's mouth gently, it wasn't even fast like she had the intent of cummimg, it was like this was boring, like it didn't matter and Mikan began to gulp at an increased rate, swallowing all of it before finally. Mukuro was finished.

She walked up to Yukizome and wiped her cock on the women's blue skirt suit, leaving a small stain, before tucking her rod back in her pants.

"She's all yours." Mukuro stared at her with no emotion, leaving Mikan and Yukizome alone.

"This… Th-This area was meant to be off-" Chisa tried to scold her, but Mukuro was long gone, she didn't care anyway, no need to worry about that now. Yukizome slapped her cheeks with her hands and shook her head. There were more important issues right now.

"MIKAN!" Chisa rushed over and grabbed at the chain, confused at how it worked, tugging at it to try and pull it from the wall, but sadly only Mikan and Miu Iruma (the inventor of the thing) knew how to let it emergency release.

"Ohh. Miss Yukizome, I knew you'd be here once in a while, I just didn't think it'd be so soon. H-Hehe. It's a little embarrassing. I would have tried to look my best for my favourite teacher if I knew." Mikan giggled, her mind completely gone. Her brain mush from the light face fucking she took from Mukuro, though maybe it wasn't JUST Mukuro, the girl was kneeling in pee, surrounded by it. It seems like someone else must have used her before Chisa arrived. If not multiple people.

Chisa growled and scowled down at her.

"What the HELL do you think you're doing in a place like this… Y-You. W-Why are you- MIKAN! What is wrong-" Chisa was trying to find the right words, words to comfort her student into letting her know what had happened, but only confusion and honest awe of her situation came out, she was so choked up, seeing one of her students like this. She felt like a failure until she felt a hand on her.

"Don't worry Yukizome. I… Like this life. Unlike my life before, I feel sure of myself, I understand why I am here and why I want to be like this. Please. Don't take this away." Mikan's hand was on her skirt, directly touching her crotch region. The second the teacher noticed she jumped back and went slightly pale.

"NO MIKAN!" Chisa Yukizome. Had the biggest cock out of all the people Mikan had been with, it was a huge 2.5 feet. Impossibly large and yet. She had it. She wanted to run away and just get the police to deal with it, but now she was in the path of a predator.

Mikan had crawled from the wall, the chain around her neck pulling just far enough so that Chisa was blocked off, anywhere Chisa tried to move Mikan blocked her. She was insane, like an animal hunting for food, but all she wanted was pee?!

Chisa's heart was so broken at this point, she didn't give a shit and growled, tears in her eyes. Seeing someone she cared so much for, she had no idea what she could do, so she lashed out.

"FINE YOU WANT TO TASTE IT! FUCKING TASTE IT! I tried so hard to make you good! T-To make you feel proud of yourself. And you become this. How could I have failed you so badly?!" This statement being pretty ironic as all the other girls in her class were the reason she became this way to begin with.

Mikan just shook her head, she didn't cry or apologise as usual, she was calm and crawled over.

"No Miss…You see, you did help me-" Mikan lifted her skirt.

"You helped me realise that I needed something new" Mikan put a hand on the women's underwear.

"You helped me see that nursing wasn't my true calling" Mikan pulled it down, not even acknowledging her size despite it being right before her now.

"I want to repay you… And everyone else… So please. Use me." Chisa's dick was now hanging low, yet Mikan's eyes stayed in hers, the eye contact made her feel better, but at the same time. This was a conversation about agreeing to piss in a student's mouth!

"Mikan… Ugh. I can't… Say no." Chisa wanted to fight, she was willing to fight, but the look in Mikan's eyes. She knew there was no point, Mikan was determined and hid nothing of her own confidence in herself. Chisa sighed and picked up her thick meat, it was so large it needed two hands and Mikan opened her mouth.

Chisa didn't need to do this, she could just leave. But at this point she knew Mikan wanted more. She didn't just want a simple pat on the head.

What Mikan wanted… Was pee.

Chisa had no idea where all this came from, why this was happening. But to be her teacher, she needed to support her and show her that she loved her. Even if it meant doing something awful. So she began.

"Ngh!" A small groan came from Chisa's mouth as she looked at Mikan. She wanted to fight back, but she needed to support her. Everything she had thought about being a teacher, being kind, being helpful and pushing people in her classes to their dreams was being tested. Her usual support wouldn't help here.

But she didn't know anything else.

Chisa let out a tiny whimper and began, her stream beginning to run down Mikan's chest as Chisa avoided Mikan's face to begin with, covering the prior nurse's naked breasts with her pee, watching it trickle down, until it stopped.

Not because Chisa had stopped, but because Mikan had moved… She had a grumpy look on her face and had repositioned herself so that the stream flowed into her throat, unlike before with the girls. She had grown and now knew this was her purpose, shivering with joy at the stale taste and the disgusting flavour of the pee. She wanted more of it and didn't hide that fact as she tracked Chisa's penis with her eyes, following it in case she tried to move it.

Chisa grabbed a bit of her blue clothing, biting down on it, trying to ignore what she was doing. But hearing the desperate-

GULP GULP GULP GULP

Of Mikan's throat, happily lapping up all she could. It made it hard to hide from it.

And what's worse is that she liked this, the feeling of peeing on someone, peeing on an Ultimate Student no less, it made her excited, her cheeks blushing as she stared at her student. No longer avoiding the nurse's gaze.

She watched as Mikan energetically gulped down, slurping and giggling as she held her mouth open. Filling the bathroom with small gurgles as she drank. And finally, the tap ran out. Mikan almost seemed drunk as she smiled at her.

"Thank you… Did you… Enjoy. *Gulp* M-Mikan's services Miss Yukizome? *Gulp Gulp*" Mikan let out a tiny cough before she crawled right back to her spot, leaning her back against the wall, staring forward. Like a machine. Mikan didn't even acknowledge Chisa was still here as she waited for the next person to come.

Chisa wanted to say "no" or "yes" or "maybe" but… There was nothing. She just kept her mouth shut… And walked out. Looking around the corner as she pulled up her panties, she saw Mukuro standing there and she looked up at her.

"So… You peed on her? I thought you would have. That's why I waited. You have nothing to be ashamed of, Miss Yukizome. You just accepted this is her now. Mikan isn't evil and you didn't fail her. Mikan is just useful now… Go back to Class 77 and leave her alone." Mukuro nodded to her, wanting to encourage Mikan to continue this, knowing Junko will love the Despair in her eyes.

No matter what Mukuro and Mikan were doing what they thought was right. Mukuro was keeping Mikan the way she is for her sister. And Mikan was staying the way she is to please her peers and finally become useful.

The teacher and student watched as Peko and Ibuki passed by, before seconds later hearing the now familiar sounds of gulping. Chisa's face paled and she shook her head, her own students had accepted it…

"I… Guess you're right. I won't be ashamed of myself. Mikan… Wanted this. I don't know why but as her teacher, I'll support her. I'll come back… Tomorrow." Mukuro nodded to her as she spoke.

"Good. It's nice to support students. I can see why Class 77 loves you so much." Mukuro smiled at her, even with her monotone voice it was heartwarming to hear. Even as the soldier headed back into the bathroom and Chisa heard the sound of a zip being pulled down.

Chisa's fist clenched and…

She walked away. Back to Class 77…

Waiting for her next lesson to begin. Knowing she'll be down to 15 students.